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Proceedings Paper

Design of mid-infrared photodetectors enhanced by surface plasmons on grating structures
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Paper Abstract

We propose to exploit the unique properties of surface plasmons to enhance the signal-to-noise ratio of mid-infrared photodetectors. The proposed photodetector consists of a slit in a metallic slab filled with absorptive semiconductor material. Light absorption in the slit is enhanced due to Fabry-Perot resonances. Further absorption enhancement is achieved by surrounding the slit with a series of periodic grooves that enable the excitation of surface plasmons that carry electromagnetic energy towards the slit. Using this scheme, we design and optimize a photodetector operating at lambdao = 9.8 microns with a roughly 250 times enhancement in the absorption per unit of volume of semiconductor material compared to conventional photodetectors operating at the same wavelength.

Paper Details

Date Published: 9 February 2007
PDF: 6 pages
Proc. SPIE 6475, Integrated Optics: Devices, Materials, and Technologies XI, 64750Q (9 February 2007); doi: 10.1117/12.698016
Show Author Affiliations
Zongfu Yu, Stanford Univ. (United States)
Georgios Veronis, Stanford Univ. (United States)
Mark L. Brongersma, Stanford Univ. (United States)
Shanhui Fan, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 6475:
Integrated Optics: Devices, Materials, and Technologies XI
Yakov Sidorin; Christoph A. Waechter, Editor(s)

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